Apparatus for successively making approximate and final adjustments



Sept. 5, 1950 P. w. wYcKoFF 2,521,557

APPARATUS FOR s UCCESSIVELY KING APPROXIMATE AND FINAL ADJU ENTSOriginal Filed June 3.4, 1946 3 Sheets-Sheet 1 INVENTOR.

V Paul 14 )4 ago/'7: E-E- BY Sept. 5, 1950 P. w. WYCKOFF 2,521,557

APPARATUS FOR SUCCESSIVELY MAKING APPROXIMATE AND FINAL ADJUSTMENTSOriginal Filed June 14, 1946 3 Sheets-Sheet 2 IN V EN TOR.

Sept. 5, 1950 P. w. WYCKOFF 2,521,557

APPARATUS FOR SUCCESSIVELY MAKING v APPROXIMATE AND F INAL ADJUSTMENTSOriginal Filed June 14, 1946 5 Sheets-Sheet 3 f/rgirye jays/293 14.4

Patented Sept. 5, 1950 APPARATUS FOR SUCCESSIVELY MAKING APPROXIMATE ANDFINAL ADJUSTMENTS Paul W. Wyckoff, Dayton, Ohio, assignor to ChryslerCorporation, Highland Park, Mich., a corporation of DelawareContinuation of application Serial No. 676,809, June 14, 1946. Thisapplication April 7, 1948,

Serial No. 19,517

13 Claims.

This application is a continuation of application Serial No. 676,809,filed June 14, 1946, now abandoned, and relates to a control apparatusand more specifically to an apparatus by which a control devicedetermining a certain desired condition is brought to an approximateposition determining such condition and is then adjusted accurately tofinal position for such condition.

In my copending application Serial No. 516,859,

now U. S. Patent 2,463,931, I disclose and claim a control apparatuscomprising a housing, a vane contained therein, and valve means thatcontrols the admission of pressure fiuid between the vane and thehousing so as to hold the vane against movement with respect to thehousing and to adjust the vane with respect to the housing. According tomy copending application, the housing may be adjusted to variouspositions representing desired values of a condition such as pressure ina line and the vane may be connected to a regu lator such as a spillvalve in the line so that adjustment of the housing to a new positioncauses the pressure fluid between the vane and the housing to bring thevane first to a new approximate position and then to a new finalposition causing the regulator to produce a desired value of thecondition.

According to the present application the arrangement of vane and housingis reversed; that is, the vane may be manually adjusted to variouspositions representing desired values of the condition, and the housingis connected to the regulator. This arrangement makes it possible forone part of the valve means to be directly connected to the vane androtatable with it, and simplification and compactness of the entireapparatus are achieved.

Further, according to the present application, the valve means iscomposed of a rotary or angularly movable part and a linearly movablepart. The rotary valve part is attached to the vane. The linearlymovable valve part is attached to a linearly movable condition-sensingdevice, such as a bellows.

In the drawing:

Fig. 1 is a sectional view taken on line I--I of Fig. 3, showing thecontrol apparatus forming the subject matter of the present invention;

Figs. 2 and 3 are transverse sectional views taken on the lines 22 and33 of Fig. 1, respectively;

Figs. 4-8, inclusive, are developed diagrammatic views of the valveparts of the control apparatus in different relative positions; and

Fig. 9 shows the application of the control apparatus of the presentinvention to a spill valve in a line between a supercharger and anengine.

The control apparatus of the present invention comprises essentially anangularly movable or rotatable housing I and a vane I I mounted in thehousing I0 for angular movement or rotation with respect thereto, asshown in Figs. 1, 2, and 3. The housing I0 is composed of a tubular partI2, an end piece I3 at the right as viewed in Fig. 1, an end piece I Iat the left, and members I5 and I6 dividing the housing into chambers.The aforesaid parts of the housing I0 are fixed against relativemovement with respect to one another. The end piece I4 has a sleeve-likeextension H, which embraces a tubular extension I8 of the vane II. Atone region of its length, as indicated by Fig. 2, the member I5 has arecess I9 extending from its lower face, and the member I6 has a recessextending from its upper face. At another region of its length asindicated by Fig. 3, the member I5 has a recess 2I extending from itslower face, and the member I 6 has a recess 22 extending from its lowerface. The members I5 and I6 have beveled portions 23 at the outerregions, which receive widened ends 24 of vane I I. The vane has a hub25, in which is press-fitted a sleeve 26, which has four sets ofopenings 21, 28, 29, and 30. The openings 21 and 28 are on one spiral,and the openings 29 and 30, on another spiral. For the sake ofconvenience, openings 21 and 28 are shown in the transverse plane ofFig. 2, and the openings 29 and 30, in the transverse plane of Fig. 3.The openings are correctly shown in spaced diagonal lines in thedeveloped views of Figs. 4-9, inclusive. At the section of Fig. 2 alarge opening 3| extends through the hub from the openings 2'! to thelower left side of vane II, and a large opening 32 extends through thehub 25 from the openings 28 to the upper right side of the vane I I. Atthe section of Fig. 3 a large opening 33 extends through the hub 25 fromthe openings 29 to the lower right side of the vane I I, and a largeopening 34 extends through the hub 25 from the openings to the upperleft side of the vane I I. The sleeve 26 constitutes a rotating valvepart of valve means of which the cooperating valve part is a reciprocaltubular member 35. The member 35 has spiral lands 36 and 31 and an axialland 38. Between the lands 36 and 31 is a spirally arranged set ofopenings 40. At an intermediate region of the reciprocal valve member 35is a circular land 4 I, and the right end of the member 35 is enlargedas indicated at 42. The lands 36, 31, 38, 4| and 3 the enlarged rightend portion 42 have a tight fit within the sleeve 26, but the sleeve 26and tubular member 35 are capable of relative axial and angularmovement. A fluid-admitting opening 43 is located between the land 4Iand the right end portion 42.

The left end of the rod 44 and a pin M going through the left areembedded in the right end of the tubular member 35, so that relativeaxial movement and angular movement between rod and tubular member areprevented. A threaded portion at at the other end of the rod 44 isadjustably connected to a cupped central portion 46 of a plate 47. A nut48 fixes the rod 44 to the plate 67. The plate 41 is connected to oneend of a vacuum bellows 19 having, a spring 50 therein preventingcollapse of the bellows. The other end of the bellows is connected to amember 5|, secured to a casing 52. The plate 4'! isalso connected to oneend of a bellows 53, subjected to a variable pressure such as enginemanifold pressure through a passage as in the casing 52 and a fitting55. Fluid under pressure is received by way of a fitting 5'6 and apassage 51 in the casing 52, and is passed through an internal annulargroove 58 in a bore in the casing 52 and through openings 59 in a,tubular member 6!! press-fitted in the housing and piece I3 received inthe bore in the casing 52 and through openings 6! in the tubular valve26 to the space between the land 4| and the enlarged right end portionon the tubular valve member 35, whence it passes through the opening 43to the interior of the valve member 35 for a purpose to be describedpresently.

A manually operable lever 52 is secured to the tubular extension 53 ofthe vane II. A lever 63' is secured to the tubular extension I! of theend piece I4 of the housing IE3 and is adapted to be connected to agas-pressure control such as a carburetor throttle. The tubularextension I8 has drain openings 64, and the tubular extension I! has anannular groove 65 and drain openings 65 communicating with the drainopenings 64.

The tubular extension 69 on the vane II has openings 65 and an internalannular groove 66 communicating with openings El. in the tubular valvepart 26. There is a drain opening 68 in the bottom of the casing 52. Theleft end of the housing is supported by journalling of its tubularextension I! on a closure piece 69 of the casing 52. The other end ofthe housing is supported on the tubular extension 55 of the vane II,which is in turn iournalled in the casing 52.

In the position of Fig. 4 the valve parts 26 and 35 are so positionedthat the spiral lands 36 and 3'! on the valve part 35 cover the openings2'1, 28, 29, 34), and thus pressure fluid coming through the openings 40in the valve part 35 cannot pass to the chambers formed between the vaneI I and the housing III. Likewise, fluid already present within thehousing between the housing and the vane cannot escape, because exit forthe fluid through the Openings 2?, 28, 29, 35 is blocked by the lands 36and 3?. Thus the vane I I and housing I are looked against relativemovement. The manual lever 62 is set for a certain manifold pressure.The carburetor throttle lever 63 produces the certain manifold pressure,which is supplied to the bellows 53 through the fitting 55 and thepassage 54, causing the reciprocal tubular valve part 35 to bepositioned with respect to the rotatable valve part 26 fitted in thevane II that the lands 36 and 31 close the openings 21, 28, 29, 30 toentrance or escape of fluid from the housing I0.

Suppose now that there is a decrease in manifold pressure, because theplane propelled by the engine associated with the carburetor throttlementioned gains altitude. This is reflected in collapsing of the bellows53 and a movement to the left of plate 4?. Reciprocal valve part 35,being connected with the plate 47 through the rod 4 5, also moves to theleft and assumes the position with respect to the rotatable valve part26 illustrated in Fig. 5. The openings 21, 28, 29, are at leastpartially uncovered by the lands and 37, the openings 21, 28 receivingpressure fluid from the openings and the openings 29, 323 being enabledto discharge fluid through the drain openings 5?. The fluid loci: of thevane II in the housing it is broken. As seen in Fig. 2, pressure fluidpasses through the openings 21 and 2 3 in the valve part 25 and thencethrough the openings SI and 32 in the hub 25 of the vane II into thechambers between the housing II] and the vane i! to the left of thelower half of the vane and to the right of the upper half of the vane.As seen in Fig. 3, pressure fluid escapes from the chambers to the rightof the lower end of the vane and to the left of the upper end of thevane through the openings 33 and 34 in the hub 25 of the vane I I andthe openings 29 and 39 in the valve part 26 and thence along theexterior of the valve part 35 and out through the openings in the valvepart 25. to drain. The vane II is held against movement by itsconnection with the manual control lever 52, and so the housing It movesin a counterclockwise direction as viewed in Figs. 2 and 3, causing thelever 53 to move with it and. thereby to adjust the carburetor throttleto the point where the manifold pressure will be returned to the valvefor which the manual control lever 6?. is set. When this occurs, thebellows 53 will return to its original position, moving the valve partto the right back to the relative position with respect to the valvepart 25 shown in Fig. 4, in which position the lands 36 and 37 cover theopenings 2?, 28, 29, 30. Now fluid can neither enter nor escape from thehousing Hi, and the housing and vane II are locked by the fluid againstrelative movement.

If the manifold pressure rises above the value for which the manualcontrol lever 52 is set, the bellows 53 expands causing the plate 4? andthe valve part 35 to move to the right. The relative position assumed bythe valve parts 28 and 35 is not shown, but it can be pictured. Thelands 36 and 37 and the openings #33 move to the right, causing theopenings 2.; and St to receive pressure fluid from the openings it? andthe openings 27 and 2S to be connected to drain through the openings and58 and the groove 65. As seen in Fig. 3, the pressure fluid passesthrough the openings 29 and 39 in the tubular valve part 25 and throughthe openings 33 and 32 in the vane hub 25 to the chambers on the housingIt to the left of the upper end of the vane I I and to the right of thelower end of the vane I I. As seen in Fig. 2, fluid in the chambers inthe housing In to the right of the upper end of the vane I I and to theleft of the lower end of the vane I I drains through the openings 3| and32 in the vane hub and the openings 21 and 28 in the tubular valve part26 and thence along the exterior of and beyond the left end of thetubular valve part to the drain openings 64 and 65. Thus the housing i8is caused to rotate with respect to the fixed vane I I in a clockwisedirection as viewed in Figs. 2 and 3, Thus the lever 63 is rotated so asto adjust the carburetor throttle to restore the manifold pressure tothe value for which the manual con- 5. trol lever 62 is set. When thishappens, the valve parts 26 and 35 return to the relative position ofFig. 4, and the vane I I and housing ID are locked against relativemovement by the fluid within the housing. r

Fig. 4 shows the valve parts as and 55 in relative position for anintermediate manifold pressure. Fig. 6 shows the Valve parts in relativeposition for a relatively low manifold pressure. If now a highermanifold pressure isdesired, the manual control lever 52 is shifted torotate the vane I I in a counterclockwise direction as viewed in Figs. 2and 3. The fluid lock between the vane I I and the housing I causes .thehousing and the lever 63 also to be shifted in a, counterclockwisedirection. It is to be noted that a complete fluid lock between vane andhousing is operable through only. a few degrees of relative angularmovement between tubular sleeveZB and valve part 35; that is, until thevalve openings 21-, 28, 29, 3!) move away from the position of registryin Fig. 6 with the lands 36 and 31. However, the fluid lock is at leastpartially effective while the lands 35, 3? partially close the openings27, 28, 29, 35. Thus the lever 83 brings the carburetor throttle to anew approximate position for ap proximately producing the manifoldpressure for which the manual control lever 62 is now set.Simultaneously with the above the valve part 26 is rotated with respectto the valve part 35 to the position shown in Fig. "7. In this positionthe openings 2'? and 28 in the valve part 25 receive pressure fluid fromthe openings at in the valve part 35, and the openings 29 and Bil areconnected to the drain openings pressure fluid passes through openings33 and. 3.4 in the vane hub to the chambers in the housing 45 to theleft of the upper end of the vane II and to the right of the lower endof the vane I I. As

seen in Fig. 3, fluid in the chambers to the left of the lower end ofvane i l and to the right of the upper end of vane ll drains throughopenings 33 and 3:3 in the vane hub 25 and openings 29 and 55 in thetubular valve part 25. Thus the housing It is also rotatedcounterclockwise with respect to the vane I 5 through action of thepressure fluid in addition to being rotated counterclockwise in anabsolute sense by virtue of corresponding rotation of the vane H and thefluid lock initially existing between the vane II and the housing Iii.When the predetermined higher manifold pressure is reached, thatpressure acting upon the bellows 53 moves the plate 46 and the tubularvalve part 25 to the right, and the spiral lands 36 and 31 are caused tocover the openings 2?, 28, 25, 38, as indicated in Fig. 8. Thus thefluid lock of the vane I i and the housing Iil is reestablished, andthese partsare held against relative movement.

When a lower manifold pressure is desired, the vane I i and housing I iiare shifted inamanner not shown but readily pictured. The manual controllever 52 is actuated to rotate the vane II in a clockwise direction asviewed in Figs. 2 and 3. The fluid lock between the vane and the housingIll causes the housing also to be rotated clockwise, the housing movingthe lever 53 so as to adjust the carburetor throttle for a newapproximate position producing the new desired lower manifold pressure.Clockwise movement of the vane II will produce a similar movement ofvalve 25 as viewed in Figs. 2 and 3 or an upward movement of theopenings 23', 28, 25, 35 in valve 25 from the position of Fig. 8. In thenew position the openings 21, 28 and the openings 25, 30 will As seen inFig. 2, the

8" be above the land and the land 31, respectively. The openings 29 and31! receive pressure fluid through the openings in the valve part 35,and this pressure fluid passes through the openings 33 and 34 of thevane hub 25 into the chambers to the lower left and the upper right ofthe vane I I, as viewed in Fig. 3. As viewed in Fig. 2, fluid from thechambers to the lower right and the upper left of the vane II escapethrough openings 3| and 32 in the vane hub 25 and open lugs 21 and 28 inthe valve part 25 and thence along the exterior of the valve part 25 todrain through openings 54 and 6G and the groove 65. Thus the housing I 0is rotated clockwise with respect to the vane II through action of thepressure fluid in addition to being rotated clockwise in an absolutesense by virtue of corresponding rotation of the vane I I and the fluidlock initially existing between the vane I I and the housing II]. Theaforesaid movement of the housing Ill causes the lever 63 to adjust thecarburetor throttle, and when the new desired lower value of themanifold pressure is reached, collapsing of the bellows 53 will havecaused the tubular valve part 35 to move to the left so that the valveparts 25 and 35 are in the relative position of Fig. 6, in which thelands 36 and 31 on the valve part 55 cover the openings 2?, 28, 29, 30and thereby create a fluid lock of the housing It and vane I I by preventing fluid both from entering the housing and from escapingtherefrom.

The end of the tubular extension I8 of the vane I I is closed by a plugIt so that fluid draining from the housing it through the openings 2?and 28 in the valve part 25 will not flow out the end of the tubularextension IS, but will instead flow through the openings 65 and 56 andthe groove 65 and then out the opening 58 in the bottom of the casing52.

There are provided in annular groove 'II and a plurality of openings I2in the right end of the tubular valve part 26 and a downwardly slopingpassage 13 in the tubular extension 60 of the vane II and in the rightend of the casing 52, through which fluid moved to the right of theinlet passages 59 and BI along the enlarged right end of the valve part35 will escape into the casing 52 for drain through the opening 63rather than onto the bellows 53.

As seen in Fig. 2, the recesses i9 and 20 are provided in the members I5and It so that even when the housing Ill is rotated counterclockwisefrom the position shown in Fig. 2 to effect contact between the membersI5 and i5 and the vane II, pressure fluid may still enter between thevane II and the housing In by way of the openings 21 and 28 in thetubular valve part '26 and the openings 3| and 32 in the vane hub 25. Asseen in Fig. 3, the recesses 2| and 22 are pro vided in the members I 5and I6 so that even when the housing I 0 is rotated clockwise from theposition of Fig. 3 to effect contact between the members I5 and I6 andthe vane II, pressure fluid may still enter between the vane II and thehousing Ill by way of the openings 29 and 35 in the tubular valve partand the openings 33 and 34 in the vane hub 25. g

The control device of the present invention is capable of many usesbeside the one just shown and described. Fig. 9 shows it used forregulating the pressure in a, line between a supercharger by means of aspill valve. The spill valve is designated by the numeral 14 andoperates in an outlet 15 in a line I6 connecting the supercharger andthe engine. The valve 14 is controlled by means 'l'l extending fromconnected to the lever 63. Pressure existing in the line 16 istransmitted through a line E8 to the bellows 53. The operation of thecontrol device is as previously described.

I claim:

1. In combination, an outer containing member, an inner member containedwithin the outer containing member, fluid means foradjusting the outercontaining member with respect to the inner contained member, valvemeans for causing the fluid means to produce the aforesaid adjustmentand to hold the members against adjustment with respect to one anotherby a fluid loch, the'fluid lock causing shifting of the inner con tainedmember to a new position to adjust the outer containing member to anapproximate new position, means connecting the valve means wit theinner-contained member for causing shifting thereof to its aforesaidposition to break the fluid lock and to cause the fluid means to morethe outer containing member to an accurate new position, and meansresponsive to assumption by the outer contained member of its accuratenew position to cause the valve means again to provide a fluid lock ofthe members with respect to one another.

2. In combination, an angularly movable housing, a vane angularlymovable withinthe housing, means for manually adjusting the vane to anew position, means for supplying fluid under pressure between the vaneand housing to produce angular movement of the housing in one directionwith respect to the vane, means for supplying fluid under pressurebetween the vane and housing to produce angular movement of the housingin the opposite direction with respect to the vane, a pair ofcooperating valve parts blocking escape andentry of fluid underpressurebetween the housing and the vane byway of the aforesaid pair ofsupplying meansfor providing a fluid lock between the vaneand thehousing and thereby causing movement of the vane .to its newposition tobring the housing to. an approximate new position, means connecting onevalve-part. to the vane for causing movement of the vane ;to

its new position to shift the saidone valve'part with respect to theother valve part for connecting one supplying means to a source offiuidunder pressure and the other supplying means to drain to move thehousing to-a final new position, and

tive adjustment between them, means-for manu- 1 ally shifting the vaneto anew position and=therewith shifting the means forming the fluid lockto 1 bring the housing to an approximate new-position, means responsiveto shifting ,of ,the vane to break the fluidlockand to adjust the.housing with respect to the vane to bring the housing to an accuratenewposition, and meansresponsive to assumption by the housing ofitsaccurate new position to restorethe fluid lock between the vane and thehousing.

4. In combinationan angularly movable-housing, an angularly movable vanemountedwithin the control device, and itisto be understood that thismeans will bethe-housing, means formanually moving the vane to a newposition, a first valve part positioned within the vane for conjointangular movement therewith about the axis of the vane, a second valvepart mounted in the first valve part for straight-line movement withrespect thereto, means for supplying pressure fluid between the vane andhousing to produce angular movement of the housing in one direction withrespect to the vane, means for supplying pressure fluid between the vaneand housing to produce angular movement of the housing with respect tothe vane in the opposite direction, the valve parts being relativelypositionable to block escape and entry of pressure fluid betweenthe-housing and the vane for providing a fluid lock between the housingand vane and thereby causing movement of the vane to its said newposition to bring the housing to an approximate new position, angularmovement of the vane to its said position producing angular movement ofthe first valve part with respect to the second valve part causing onesupplying means'to be connected to a source of pressure fluid and theother supplying means to be connected to drain for angularly moving thehousing to bring the housing to an accurate new position, and meansresponsive to assumption by the housing of its accurate new position tomove the second valve part ina straight line with respect to the firstvalve part for restoring the fluid lock between the vane and housing.

5. In combination, an angularly movable housing, a vane mounted in thehousing for angular movement, means for supplying pressure fluid betweenthe vane and housing to produce angular movement of the housing in onedirection with respect to the vane, means for supplying pressure fluidbetween the vane and housing to produce angular movement of the housingwith respect to the vane in the opposite direction, an angularly movablevalve part and a reciprocal valve part cooperating with one another toblock escape and entry of pressure fluid between the vane and housing byway of the aforesaid supplying means for providing a fluid lock betweenthe vane and housing and thereby causing movement of the vane to a newposition to bring the housing to an approximate new position, meansconnecting the angularly movable valve part to the vane for causingmovement of the vane to its said position to move angularly theangularly movable valve part with respect to the reciprocal valve partfor connecting one supplying means to a source of pressure fluid and theother supplying means to drain to move the housing to an accurate newposition, and means responsive to assumption by the housing of theaccurate new position to shift the reciprocal valve part in a straightline with respect to the angularly movable valve part for restoring thefluid lock between the housing and the vane.

6. In combination, an angularly movable housing member, an angularlymovable vane member mounted in the housing member, means for supplyingpressure fluid between the members to produce angular movement of onemember inone direction with respect to the said other member, means forsupplying pressure fluid between the members to produce angular movementof the said one member in the opposite direction with respect to thesaid other member, an angularly movable valve part and a reciprocalvalve part cooperating with one another to block escape and entry ofpressure fluid between the .members by way of the aforesaid supplyingmeans for providing alfluid lock between the members and thereby causingmovement of the said other member to a new position to bring the theangularly movable valve part. for causing movement Of'thG said othermember to its said positionto move angularly the angularly movable valvepart with respect to the reciprocal valve part for breaking the fluidlock and consure fluid and the other supplying means to drain to movethe said one member to bring it to an accurate new position, and meansresponsive to assumption by the said one member of the accurate newposition to shift the reciprocal valve sentin a desired value of thecondition, a rotatable valve part mounted in the vane for conjointmovement therewith about the axis of rotation of the vane and housing, areciprocal valve part mounted in the rotatable part for movement withrespect thereto along the aforesaid axis of rotation, means forsupplying pressure fluid between the vane and housing for moving thehousing with respect to the vane, the valve parts being so positionedupon start of the movement of the vane to its said certain position asto prevent entrance or exit of pressure fluid between the vane andhousing by way of the supplying means and thereby to provide a fluidlock of the housing with respect to the vanecausing movement of the vaneto its said certain position to position the housing for approximatelyproducing the desired value of the condition, the movement of the vaneproducing a movement of the rotatable valve part breaking the fluid lockbetween the vane and the housing and adjusting the housing foraccurately producing the desired value of the condition, andcondition-responsive means movable along the said axis of rotation andconnected with the reciprocal valve part so as to restore the fluid lockbetween the vane and housing upon arrival of the desired value of thecondition.

8. Apparatus for controlling the value of gas pressure, a housingrotatable to produce various values of gas pressure, a vane rotatablymounted in the housing to various positions representing various valuesof gas pressure, means for manually adjusting the vane to a certainposition representing a desired Value of gas pressure, a rotatable valvepart mounted in the vane for conjoint movement therewith about the axisof rotation of the vane and housing, a reciprocal valve part mounted inthe rotatable part for movement with respect thereto along the aforesaidaxis of rotation, means for supplying pressure flLud between the vaneand housing for moving the housing with respect to the vane, the valveparts being so positioned upon start of the movement of the vane to itssaid certain position as to prevent entrance or exit of pressure fluidbetween the vane and housing by way of the supplying means and therebyto provide a fluid lock of the housing with respect to the vane causingmovement of the vane to its said certain .10 necting one supplying meansto a source of presposition to position the housing for approximatelyproducing the desired value of gas pressure, the movement of the vaneproducing a movement of the rotatable valve part breaking the fluid lockbetween the vane and the housing and adjusting the housing foraccurately producing the desired value of gas pressure, anexpansible-collapsible unit responsive to gas pressure so as to expandand collapse in the direction of the said axis of rotation, and meansconnecting the expansible-collapsible unit with the reciprocal valve forcausing arrival of the desired value of gas pressure to shift thereciprocal valve with respect to the rotatable valve so as to restorethe fluid lock between the vans and the housing;

9. In combination, an angularly movable housing, a vane angularlymovable within the housing, means for supplying fluid under pressurebetween the vane and housing to produce angular movement of the housingwith respect to the vane, an angularly movable valve part, a valve parthaving straight-line movement with respect to the angularly movablevalve part and cooperating therewith to cause one relative position ofthe valve parts to produce a fluid lock of the housing and vane bytrapping pressure fluid between the housing and vane and other relativepositions of the valve parts to allow the pressure fluid to produceangular movement of thehousing with respect to the vane in one directionor the other, means for angularly moving the vane to a new position andthereby causing the fluid lock between the vane and the housing to movethe housing to an approximate new position, means connecting the vaneand the angularly movable 'valve part to cause movement of the vane toits new position to move the angularly movable valve part with respectto the other valve part for breaking the fluid lock between the housingand the vane and allowing the pressure fluid to produce angular movementof the housing with respect to the vane to an accurate new position, andmeans responsive to assumption by the housing of its accurate newposition to shift the valve part having straight-line movement withrespect to the angularly movable valve part re-establishing the fluidlock between the vane and the housing.

10. In combination, an angularly movable outer valve part having anaxial opening and two axially spaced parallel sets of helically arrangedopenings connecting the axial opening and the exterior of the outervalve part, and a linearly movable inner valve part fitting within theaxial opening in the outer valve part and having a central opening and ahelically arranged set of openings connecting the central opening andthe exterior of the inner valve part and parallel spaced helical landsformed on the exterior of the inner valve part at opposite sides of theset of openings in the valve part so as to be adapted to cover the setsof openings in the outer valve part, whereby linear movement of theinner valve part in one direction or the opposite direction places theset of openings in the inner valve part in communication, respectively,with one set of openings in the outer valve part or with the other set,and angular movement of the outer valve part in one direction or theother will place, respectively, one set of openings in the outer valvepart or the other set in communiaction with the set of openings in theinner valve part.

11. In combination, a flrst angularly shiftable member, a secondangularly shiftable member,

arses-55v 11 valve'means including. an angularly 'movable valve part anda linearly movable valve part cooperable with one another to cause onerelative position of the valve parts to produce a lock of other withrespect to thefirst member; angular shifting of the first member to anew. position causing the fluid lock between the members to shift thesecond member .angularly to an approximateinew position, meansconnecting the angularly movable valve part and the first member forcausing the aforesaid shifting thereof to shift the angularly movablevalve part with respect to the linearly movable valve part and therebyto break thefiuid lock between the members and to shift the secondmember to an accurate new position, and means responsive toiassumptionby the second member of the accurate new positionfor moving the linearlymovable valve partrwith respect to the angularly movable valve part torestore the fiuid'lock between the members.

12. In combination, first and second members associated with one anotherso as to hold pressure fluid between them and being relatively movable,a rotatable valve part and a movable valve partzcooperable with oneanother to cause one relative position of the valve parts to producea'fluid lock of the members to one another and other relative positionsto cause the pressure fluid to move the. second member in one directionor the other with respectto the first member, shifting of the firstmember to a new position causing the fiuidlock between" the members toshift the second member to an ap'proxirnate new position, meansconnecting one valve part and'the first member for causing theaforesaid'shifting of 'the first member to shift the said one valve partwith'respect to the other valve part to break the fluidlock between themembersand to adjust the second member toanaccurate new position, and"means responsive to assumption bythe second member of the accuratenewposition for shiftin the said other-valvepart with respect to the saidone valve part to restore the" fluid lock-between the members.

' 13. In combination, an angularly shiftable housing, an-angularlyshiftable vane mountedin the housing, a rotatable valve part and amovable valve part cooperating with one another so as to causethe'valveparts to be relatively positionable to establish a'lock of pressurefluid'between the housing and the vane and to "be-relatively positionable toadjust the :housing with respect *tothe vane in one direction'ortheother, shifting of the vane to a new position causing'the fluid lock toshift the housing to an'approximate new position; means connecting'the'rotatable valve part and the vane' for causing'xthe'aforesaidshifting of the vane to shift the rotatable valve part with respect tothe movable valve partto break the fluidlock and to adjust the ho1 1sing to an accurately new position, and means responsive to assumption bythe housing. of the. accurate new position to shiftthemovablevalve-partwith respect to-the rotatable ,-valve part forrestoring the-fluidlocl; between the vane and housing.

-PAUL W. WYCKOFF.

- REFERENCE S. CITED "The following references are of record in the fileof this patent:

UNITED STATES PATENTS Number Name Date 2,402,885 .Gilfillan June 25,1946 2,463,931 Wyckofi --Mar.' 8, 1949 FOREIGN PATENTS 40 Number,Country I Date 464,891 a Great Britain Apr. 27,; 1 937 Certificate ofCorrection Patent No. 2,521,557 September 5, 1950 PAUL W. WYCKOFF It ishereby certified that error appears in the printed specification of theabove numbered patent requiring correction as follows:

Column 9, line 20, for the word valve read value;

and that the said Letters Patent should be read as corrected above, sothat the same may conform to the record of the case in the PatentOfiice.

Signed and sealed this 21st day of November, A. D. 1950.

THOMAS F. MURPHY,

Assistant Gammz'ssz'oner of Patents.

